#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define nmax 260
#define smax(x) (x*(x-1)/2)

int n,s,i,j,d[2][smax(nmax)],tr;

int main()
{
    freopen("1-sir.in","r",stdin);
    freopen("1-sir.out","w",stdout);

    scanf("%d%d",&n,&s);
    d[tr][0]=1;
    for (i=2;i<=n;i++)
    {
        tr=1-tr;
        memset(d[tr],0,sizeof(d[tr]));
        for (j=0;j<=smax(i);j++)
        {
            d[tr][j]=d[1-tr][j+i-1];
            if (j>i-1)
                d[tr][j]+=d[1-tr][j-i+1];
            else
                d[tr][j]+=d[1-tr][i-1-j];
        }
    }
    printf("%d\n",d[tr][s]);
        
    return 0;
}